1044 MB. W. p. PYCEAFT ON THE [Uec. 19, 



B. Greatest width of sternum across posterior lateral processes more tlian ^ — 

 sometimes equal to — its whole length ; metastermim deeply notched, not 

 projecting so far back as ends of posterior lateral processes ; coracoid 

 groove very deep ; no spina externa or interna ; no precoracoid ; posterior 

 lateral processes of coracoid short and blunt ; scapula with long acromion. 



PoDICIPEDIDjB. 



D. Peltic Giedle. 



Greatly elongated and compressed laterally behind the acetabulum ; closely 

 resembles that of the Oretaneuus Hespcrorni», and differs entirely from that of 

 any other living Carinate bird, the postacetabular ilium being represented by 

 a nearly vertical plate of bone ; synsacrum almost styliform ; pleurostea 

 caudad of acetabulum wanting ; parapophj'SL^s vestigial. 



A. Free end of pubes spatulate ColvmbidvE. 



B. Free end of pubes not spatulate PoDiciPEDiPiE. 



E. Pectobal Limb. 



The bones of the wing are relatively long; the humerus has a moderately 

 well-developed delto-pectoral crest, the coraco-bumeral groove takes the form 

 of a deep pit; there is a shallow fossa for the brachinlis internus ; the 

 fossa suhtrochanterinis is blind. The forearm is nearly or quite as long as the 

 arm. Me. III. is long, slender, and runs parallel witli Mc. II. 



A. Carpo-metacarpus much elongated ; Mc. I. very long, J as long as Mc. II. ; 



manus as long as forearm CoLYMBiDyE. 



B. Carpo-metacarpus not greatly elongated ; Mc. I. very short ; manus shorter 



than forearm PoDiciPBDrDjs. 



r. Peltic Limb. (Figs. 1-3, pp. 1038-9.) 



Femur very short ; tibio-tarsus with an enormous cnemial crest ; tarso- 

 metatarsus laterally compressed ; outer toe longest ; ungual phalanges much 

 flattened. 



A. Cnemial crest as long as or longer than femur; fibula extending downward* 



to the tarsus, or very nearly so ; the ecto-trochlear foraujen of tarso- 

 metatarsus tubular ; hypotarsus simple Colymbid/E. 



B. Cnemial crest shorter than femur ; fibula terminating near the lower 



i of the leg; hypotarsus simple; eciotrochlear foramen in the form of 

 a groove Podicii'edid.«. 



xii. List of Woeks eefeeeed to oe consulted. 



1. Beddaed, F. E.— Structure and Classification of Birds, 1898. 



2. Bbandt, J. E. — Beitriige zur Kenntn. der Naturgesch. der 



Vogel. Mem. Acad. Imp. des Sciences St. Petersbourg, 

 ser. vi. vol. iii. 1839-40. 



3. Coues, E. — The Osteology of the Cohjmhus torquatus; with 



Notes on its Myology. Mem. Bost. Soc. Nat. Hist. vol. i. 

 part ii. 1867, pp. 131-172. 



